Without knowing your disease status and history it is impossible to say. There are two schools of thought in Crohns treatment -- one saying go big and aggressive early with Remicaid, Humira and the other biologics, the other saying take it slow and climb the ladder from less potent to more potent treatments until you find one that works. The proponents of the go-slow approach say, with some justification, that while you piddle around with less effective drugs, Crohns is doing permanent damage that can lead to surgeries and other major complications.
I sincerely doubt that the motivating factor here is insurance payments. Gastroenterologists have plenty of patients and make most of their income from procedures like scopes, not remicaid infusions, which are usually done at a facility somewhere else anyway.
In your place i would ask the doc why he wants to go to the big gun now and what he expects your future disease course to be with or without it.