... You didn't get the point...
Pros can't play only for fun? Why not?
And if a pro joins a noob game for fun, he will be banned.
Nah, i vote !no this idea.
The following problem is:
STATS! Everybody plays for stats today. DotA still remains game,and as a game it should be always (unless you are Korea proffesional) played for FUN.
The usable number of PD bots is luxuriously high. However the RPG bot is still constantly occupied,and at least 33% of these games are DotA.
There are significant disadvantages for players on rpg bot.
1) RPG is overloaded,while PD is working on 50%.That doesnt stop pple from queing dota games.
2) There are no rules on RPG. The people who destroy the game wont be punished - host can probably live with it (and ability to leave freely is probably the reason why he used RPG). However ordinary players,who joins such a game, are the ones who takes the punishment.