I know you can earn defined rewards playing Single Player Challenges
but does Single Player Practice net anything?

I don't really like games dependent on live players because I'm a flakey gamer who drops out in the middle of games alot if real life is happening thus discouraging other gamers; getting tired of getting ditched during matches.

No.

I'm sorry carnival, but we have very strict rules in this forum. You are only allowed to ask about Gwent if you make sure to NOT mention you are asking about Gwent, thus leaving everyone else confused as hell. :P