[Klrdds]

I normally post on the Autograph thread on Net 54, but I also collect baseball cards ( I have a few hundred thousand cards going back to Old Judge and Topps complete sets to 1959 and many graded and ungraded RCs) but I admit my knowledge is average at best about trends in card prices .
This is why I am coming here to see if someone can offer their opinion about the 1990 Frank Thomas no name on front RC. I have this card ( PSA 7.5 )which I purchased before his HoF induction and I have been watching its price increase over time. I know nothing is a guarantee BUT can anyone give an opinion about this card in general and its value ceiling ?
Is it on a bubble that could burst or do people believe it will continue to rise?
I realize that a "sudden " find of these would dramatically affect the value of this card but considering that after 27 years there hasn't been a find I would be content assuming that all of these cards have been found, but possibly not graded.

Thanks for any opinions.