I believe the market will go up over time. Marvel continues to fish for a new fan base. (marvel rising). They always have thrown stuff out there to see what "sticks", but I think they will get more savvy about it.
they are looking international (asian) and at the female tween demographic. The movie era will provide collectability for any of our lifetimes and after that, high quality essential comics will be still worth a lot.
the market might rise and fall with the general art and precious metals markets...
im newbie, so grain of salt time ....