The fees stack up rapidly. The Broadcast TV fee is up to $10 and the Regional Sports Channel fee is up to $8.25. There are also franchise fees, PEG fees, Recovery fees and FCC fees so the combination on your bill is likely more than the $15 that you were quoted and then there's the taxes (sales tax and any other taxes that your taxing jurisdiction might levy on cable TV service).
If you use a TiVo, there may be charge for a CableCARD and if you don't buy the lifetime service for TiVo, that will be $14.99/month (with one year commitment, $19.99 without) for each DVR. Lifetime Service is $549. You may be able to find a used SD TiVo that will work that already has Lifetime service. If the SD TiVo doesn't come with Lifetime service, TiVo probably won't activate it. Without a CableCARD or a box, you get no channels at all.
After the 24 month commitment (that you may have to pay up to $20/month to get out of early), the price for the TV package will likely double.
I highly recommend that you sit down with someone who currently subscribes to a similar package and see what their bill looks like with special attention being paid to the fees and taxes.
Regular On Demand content doesn't score a fee per view but you may need a Comcast box to get it.