The German switched to the DTM following five seasons in Formula One, the final three with tail-enders Marussia (previously Virgin Racing). Prior to that he raced for Toyota, for whom he scored three podium finishes, and also won the 2007 GP2 title with iSport.
Since leaving F1 he has made a promising start to his tin-top career, scoring a maiden win at the 2013 season finale and grabbing a second successive podium at the red Bull Ring last weekend.
And the 32-year-old admits he has no desire to return to grand prix racing, suggesting that there is little scope for drivers who do not bring big funding.
"It is pretty clear that in the current situation there are just three or four teams who can choose and pay for their drivers," said Glock.
"The rest look for how much money the driver can bring. In my eyes, that's not the purpose of the sport.
"That's why at the moment I don't see a future and don't waste thoughts thinking about it.”
That has seen a number of highly-rated talents move there in recent years, including ex-F1 racers Glock and Paul di Resta, and young talents like Robert Wickens and current championship leader Marco Wittmann. Glock says he is happy in the series and sees no reason to move on.
"At the moment I'm having a lot of fun so I would be happy if I could continue for a few more years," concluded Glock, who currently sits 10th in the drivers' standings.