While I agree that maintenance on the older or newer for that matter Ferrari's can be pricey it really doesn't have to be. The 30k maintenance kit from Ricambi which has everything you need is only $1750 and it really isn't hard to drop the engine/transaxle on a TR. It is a complete subframe mount and requires you to remove the plumbing and some wiring, then the bolts holding the subframe and the whole thing rolls out. Takes about 4-6 hours and there she is. I know the independents charge a lot less. I've owned several Ferrari's and presently have 2 in the garage and with a little effort you will find a wide range in part prices.
No Ferrari box parts are cheap. The front wheel bearing for the TR is $700 each (ouch), but there is a fairly extensive cross reference thread that will reduce the cost of many parts, plus I shop in Europe too, there prices seem to be less.
So, if your planning to send your car to Ferrari for maintenance then hold on to your wallet. There is no free lunch there.
John