Well, the thing is, the Economy of the game was different a year ago.
less people played, and less people collected(that second part is probably a Lie)
and with all the people who leave, i'm sure those commons are much more rare than you could expect.
Melissa was like 500 below when she wasnt cr yet and sigmund was like approx 1000
but what you know,when the staff announced that they'll be cr,they were both at 30,000 each,now prices go up,approx 100,000...more than 3 x the price i guess