It makes sense for customers that have already bought the product, to be able to access the store page for promos etc. Some time back, Rendo removed the pages for unavailable products, and the protest was massive. I for one am really glad I can go back to the product page to see what it actually is before I install it! Other shops remove the product pages of removed products, and then I have no idea of knowing what the product is without downloading it and opening the zip.