Is it foolish to post a Kickstarter campaign for a SaaS that is primarily for businesses (not consumer oriented)?

It's not foolish, but it's going to be extremely hard to pull it off. I would consider starting with a beta program so you can have some paid clients to pay for the company's expenses.

After you have some traction, you can raise a seed round.

I would honestly advise against using Kickstarter to launch a Saas product. Unless you can build a really targeted list before hand and then email them. You won't see a ton of organic growth from the Kickstarter platform.

Kickstarter works best for consumer products or art projects. This does two things:
1. It has wide appeal.
2. There is a tangible product afterwards that the backers can enjoy.

B2B SaaS has neither of these two. Instead, use producthunt or hackernews to get feedback (and early customers) on your product. Does that help?