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From the first few eps we can assume Shredder has a ninja army, control over the local thugs and punks in the city and also ran his fake protection racket (which was kinda similar to Mirage, now that I think about it).
Krang and the Technodrome were underground around the time and probably saw this on his view screens and thought to himself 'this guy got control of the city, let's see what he says'.
I mean in the beginning it made sense, Shredder had no intention of building Krang his body and was just dragging it out while using all the alien technology to his advantage. It got to the point where Krang purposely sabotaged his plans when he was too close to killing the Turtles for the sake of getting his body.
I mean, it kinda went on from there. In season 2, Krang used Shredder as his errand boy to get whatever he needed to bring the Technodrome back to Earth. Afterwards it was to get whatever they needed to get the Technodrome either off of wherever they were stuck in or to re-power the Technodrome.
I think the main reason is, Krang hates doing his own dirty work and he needs someone to do all the stuff for him. That's why it's kind of a big deal whenever he actually gets involved.
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