Richie Rich comics, are they in demand and how much are they worth?

I have a HUGE Collection of Richie Rich Comics I collected them mostly in the 80's, we are talking 3500 +.  I do not know how much the collection is worth or if it is even in demand, I have issue number 3 in great condition with only yellowing of the pages which was kept in mylar.  Anyone know how much it may be worth?  I have quite a few low numbers in the Richie Rich poor little rich boy title.  Any feedback would be appreciated as I really want to sell them.  Taking up too much space, lol.  Thank you in advance.