Yeah this is very true with all the options it has I can see where the costs add up. I think my next rifle is just going to be a semi custom on a 700 action with a Bartlein barrel. After doing this last one, I am spoiled. Loads are easy to develop and there's practically no break in period and no frustration. It's nice to buy a complete factory rifle ready to go, but it's all a gamble and few of them are as forgiving as custom barrels as far as bullet, powder, primer combos.
This is what I've been doing for years...Pawn shop special donor 700's. I mentally build the rifle, go find me a donor action, order and get all my parts in, and then take it to the smith. The only reason I got that 2nd 5R .300WM was because I only paid $100 bill for it after I traded in my InAccuMark .257 Wby. Can't beat a $1,300 rifle for $100...
I will say this, my 5R .308 Win, has shot everything from 168's up to 210's into bughole groups. It's not picky at all, and the only thing I've done to that gun was a trigger swap, and torqued the action screws to 65 inch-pounds.
I may be turning my .270 into a donor if it doesn't shoot after I finish upgrading it. I might make a thread on it. Have to redo the bedding (previous owner had it done) and a few other things. Never payed much attention to it because it was just a deer rifle and it has always shot pretty decent until the last couple years.
I know you're a .30 cal fan... You should build you either a .25-06 AI, 6.5 Sherman, .280 Sherman, or .300 Sherman. That way you can still utilize all those .270 Win cases.