What made your previous company a "joke"? Was it because they didn't offer color sealing and repair?
I don't offer either myself. I simply clean and seal.
You can do a good job, as others have said, simply using a 500 psi portable and a rotary machine with a scrub brush. Heck, with a good scrubbing, even your chemicals don't have to be all that great. Of course, good chems make the job go easier and great heat and higher pressure sure help a lot too, but don't think you can't do a great job with lesser tools.
In fact, tile and grout cleaning is like carpet cleaning used to be back in the 70's. Not enough cleaners are doing it, right now, to drive down the pricing of it. It wouldn't surprise me to see, in 20 years, the prices cleaners are getting then will be the same as we are getting now. So, while the pricing is profitable, get into it.
You can make good money even if you are slow at your production rates.