You can't have your cake and eat it too here, everything costs, and player experience is king.
Cheating happens, we don't want it to, but we do the best we can with what we have, and if it's not enough: play on a platform that does not allow memory modification and injection. It's damn impossible to "secure" a client, and when we do people cry about DRM. (I'm not saying that some DRM isn't to "prevent piracy" and I'm a free software advocate so I hate DRM, I'm just saying that if we included DRM in our game people would go nuts about it- but it would help solve the issue here).