What are the key challenges / metrics in implementing an online subscription model targeting consumers?

There are merits to both options, but unless your economics dictate one over the other, the choice should be made by your consumers. I would suggest that you use landing pages to test both pricing models and let the relative click-through-rates tell you which is the right way to go. Validate the consumer preferred model before you commit to it. You may discover one as a clear winner overall, or that one wins out in a key market segment. You may also find that the distribution is fairly even. Keep in mind that it is possible to utilize both - think Amazon selling audio books, but also offering Audible Subscriptions. Ultimately, you'll want to make sure that the economics work for you - and focus on maximizing customer LTV (life time value - ie the total you'll earn per customer over the lifetime of that customer). I'm happy to explain the process of testing these (even before the product exists) in detail. Just shoot me a message.

1. commercials / Advertising / leads. 2. In-app purchases of things that they actually need. 3. Freemium model - they only pay for extra services (like maybe you can have a dating feature or a business feature). 4. Offering complimentary services such as loans, help submitting forms, help before interviews and many other ideas. There are many more options. Happy to explain them on a call. Good luck I've successfully helped over 380 entrepreneurs, startups and businesses, and I would be happy to help you. After scheduling a call, please send me some background information so that I can prepare in advance - thus giving you maximum value for your money. Take a look at my reviews: https://clarity.fm/assafben-david

To answer your question directly, the best way to figure our the optimal revenue model is by doing exactly what you're doing right now: evaluate the trends, challenges in the market and calculate how much it costs to build your user base relative to the revenue (potential) they bring in. Commonly if your CAC is out of alignment people start by focusing on the tactics through which they acquire (which to be fair is only natural.) I though like to start on the custom side and work my way backwards. Are you targeting the "right" customers relative to your opportunity in the market. Start by focusing on this question first and making sure you're targeting the right market for your app/service. Next, I would see if you can fractionalize that market further down into a more specific/narrow subset of potential customers. This should allow you to maximize what you are producing in terms of revenue potential and also cut down on the acquisition costs side since you can focus your nozzle more directly towards the target. The bottom line is dont overlook an opportunity to make sure your target market is clearly defined and confirmed/validated. And dont be afraid to question potential false-positives (i.e. just because someone will buy your service doesn't make them necessarily the ideal customer.) try to create multiple layers and variables of filtering that help you make sure you've got the right group of people in your sights.

Have you watched Jonathan Fields' Good Life Project http://www.goodlifeproject.com/ Maybe that'll get you some ideas and inspiration. I know Jonathan and could connect you. I may have some other ideas but would need more information to know if they'd be worth trying. Let's connect

If you are going to train, commission for them only model is out of the question. A nanny service is almost a commodity, there is only so much people are willing to pay, a lot of demand but not acquired by everyone. Your profit margins will most likely be small because essentially you are getting into a brokerage service for the nannies taking a commission off each placement. Because of the low margins, you're better off maximum get each sale. Instead of making the primary business model based off 1 time hires/sales, focus on selling memberships... Try annual or bi-annual memberships that guarantees them a discount when they do actually hire, maybe offer faster or preferred services. This guarantees you operating cash flows month to month on top of the sales off each actual hire that pays for the nanny's hours worked and can give you an additional profit margin as brokerage commission. Monthly + commission - (EBIT + Op. Exp)