If the DM didn't houserule-fix the spell such that your exploit couldn't work again (or better yet, identified and shut said exploit down before it first arose), IMO you'd be well within your rights to keep using that trick forever; and it wouldn't make you a problem player in the least.
Yes, it's a problem with the books, but it's not your-as-player's job to fix said problem. It's the DM's; and because the DM didn't fix it s/he and the campaign are now stuck with it as a known thing.
Wow would this attitude get you kicked out of my game so fast (something I've never yet had to do BTW). 'No I will not adjust my behaviour as politely requested, F you'. Wow.