Is there a reason the FG values of all the incremental games (MQO, Lyr, TPT, Avabur) is dropping down to the ground?

I mean the games are obviously crap as idea and absolutely unplayable, but so far there were enough people willing to spend FG against useless currency... Did people get smarter or is there another factor I am not aware of?

you say it yourself, they are 'incremental games' so as time go on people make more currency in said game therefor the value of it drops but the people at the top ranks of those games still generate the same amount of 'value' i suppose