You're correct, but for some reason heavily downed at the moment (Edit: no longer the case!). Relevant excerpt backing this up:
> the sugar industry paid the Harvard scientists the equivalent of $50,000 in 2016 dollars
I.e. it was something more like 6k-7k in terms of dollars at the time of payment.
Average home price in the late 60s was 25k so even if it is equivalent to $50k in 2016 dollars, 25k could still get you further than today in some specific areas.
Did you know the average bribe accepted for a politician is something like 5K (This was from a few years back so probably higher now). So yeah this is totally within bribe limits.
As a unrelated note it really is depressing to think about how easy it is to buy off politicians and how much money the bribers have vs an average person.