That's very true of niche businesses; one competitor price-warring can wipe our half your enterprise customers and they sometimes haven't got any way of growing except trying to pick up their customers. Not sure it's quite so true of general purpose SaaS sold to a market as big as "people that want to collaborate", especially not when the 800lb gorilla's pricing starts at $60/user/year and their apps aren't universally loved or difficult to replicate at smaller scales