Is it ok to price your SaaS higher at the start?

Charge based on the value given to your customer. If your small set of features offers value, talk to them about what that value is. Don't guess - actually ask your early adopters what they feel is fair. After all, you'll need to be in close communication with them anyway to be sure the product matches their needs, which means you'll need an open and trusting relationship, so include price in those discussions.

By definition only a subpart of your fulltime users will convert to paying customers. So in order to be able to try the pricing I would say you must have at least 20+ fulltime customers and you should also be able to generate like 10+ fulltime customers a month. If you have less than that I would say it's better to focus on making the product better and increase conversions from signup&disappear to fulltime users. Once you have thise basic numbers it would good and brave to try the pricing.

1) Ask a couple of customers what is fair 2) See what competitors are offering

then just publish a pricing. You will learn a great deal and iterate.

Once you provide value, you have a product.

The higher the price, the more you filter out price sensitive customers. That's a good thing because price sensitive customers have the same demands as price insensitive customers, but leave you with less money to service those demands.

The higher the price, the more likely customers are to partner with you.

Features are over-rated to the degree the Unix philosophy is appropriate. The Unix philosophy is appropriate more often than not. You can deliver a more reliable product and higher levels of service the fewer features you have to support because fewer features means fewer misunderstandings about how your product works and what it will do.

Good luck.

This fear has no merit. You can always do x off for limited time and not specify the time. Look at how Intuit is pricing QBO.