I have been doing some checking and find I way overestimated the prices on decent 73's. The ones I saw at the show for 25-plus thousand were either some kind of rarity (I honestly didn't notice, just shook my head and walked away) or way overpriced, something common at that show.
Anyway, a shootable 73 can probably be had for under $4000 or less, depending on the amount of original finish (the criteria for collectors). One with little or no finish might be obtainable for under $3000. Still not cheap, and my comments on decreasing the value by shooting still stand.