need help, printing photos not on photo paper

[lukeout11]

Hi, I was wondering I work at a publishing company where we print posters, mags etc. well the poster we print are 11*17, so what i do is resize image to 5x7,8x10 ,or whatever but the pictures are glossy and its a type of thick paper stock.
My question, I dont sell my autographs right now but if in 5 years i need to am i gonna look like and idiot trying to sell autographs that arent on photo paper. The printers are very high quality and the picture look excellent but i am still wondering . Any help is great thanks

[CHIgrapher]

Yes.