To elaborate on your comment, which is absolutely 100% true, new vendors that require a certain amount of spend (basically any tech company selling you a decent sized system that does anything transactional is probably going to fall under this) usually require the municipality performing an RFP and it's a months long process to implement that and it requires a bunch of approvals up the chain. It's a pain for everyone involved, both the vendor and the bureaucrats in charge of selection. Once a vendor like Tyler that does everything is in, getting a new system from them is instead usually little more than a line item in the budget.