Aspen Dental rip off ??

I went to aspen dental to get a check up, free xrays and a cleaning. They did the xrays and checked me over, and came back with an estimate for cleaning.[this is cleaning only]  Now i am 65 years old with all my own teeth. I have not had a cleaning in a while, but i do take care to brush regularly. The estimate said i would have to come for 4 appointments, upper left one day etc.etc. the price for this cleaning was 2600.00 yes   two thousand six hundred.  I left scratching my head after declining to make an appointment  at this time.  This has been about 5 weeks,and yesterday i received my second letter from them reminding me to make an appointment, this time there was a discount coupon for $600.00  off if i scheduled by the end of the month. Now lets just say i called two weeks ago and scheduled my cleaning, i would have paid the total $2600.00  How long can one appointment  take for even the most complicated cleaning. If it took 3 hours, that would be 12 hour total to get my teeth cleaned, that would 216 .00 an hour. They do advertise dentures for under $300. Is it me or am i just to old to appreciate how much a dental assistant gets paid these days?