You guys are wrong. What you are describing are not Roleplayers. They are going beyond RP to Godmoding (for lack of a better word). They are ignoring the stats that the game gives them and making up their own.
I -am- a roleplayer. I play by my exact physical and ability stats. I do not train. I do not grind. I do not have anything against those who do. I simply do not have the time to waste on simple-minded grinding that is boring, tedious, and lame mechanics-wise.
Add into that that grinding is a VERY limiting path for roleplaying. To be a fighter, you have to be a ruthless killer. To be a mage, you have to be a ruthless killer. To be most other things at the moment, you HAVE to be a ruthless killer. I am not even taking mine-grinding into account to pay for that training.
Honestly, I don't wish to play the zealotic killer so completely devoted to training that he will kill anything in his path to get a little better. That is completely unrealistic on so many levels. It is simple mindless slaughter for no reason. You have to 'pretend' you are even doing any other than killing things only for your own selfish advancement. This article has some good points (though I do not agree with all of it).
http://www.raphkoster.com/2005/12/30/the-evil-we-pretend-to-do/I have nothing against 'powerleveling' in games, and in fact have done it in other games where it A: Was fun. B: Made sense for the character. In PS, for me, it falls short on both counts. That is why I create a character in Character Creation (yes, I use a 'cheat sheet') as close to the character I want to play, then play by those stats as someone who is at the -exact- level they want to be.