Business 101, page 1, line 1:

"Never put any friction between your customer and giving you money"

Dude, absolutely get rid of the requirement to make an account to get a quote. Understandable(ish) to need one to check-out, but hell "Check-out as guest" was probably one of the most profitable innovations in e-commerce ever.

A longer list of accounts is not worth more than a longer list of orders.