The nice thing about a SaaS company is once they get big enough, they're very stable because of their recurring revenue. (Salesforce isn't in danger of going out of business) They also can't ignore you like many big enterprise vendors, because you can turn them off on shorter notice. They have to rewin your business every year. It's just a little trickier with SaaS startups who haven't cleared the hurdle of their fixed costs yet.