Nothing wrong with profiling the customers you wish to attract and targeting them accordingly but narrow banding is not going to work for a new business especially in this field, you are just trying to attract as much business as possible it is here where you can then filter it out looking for a one legged rich pensioner busy roaming around his area in his mobility scooter and getting home before the battery runs out, if that's the market you are after
and have the luxury of being able to be so picky.
(by the way before you launch on one I know that's not what you meant)
A mix of the avenues to business as above and you can mix up and split test your Google Ad's by the way, so two are not necessarily the same,
seems to be what several business's are reporting as doing relatively cost effectively with a degree of success.So if I was starting out now or just looking to attract new business then this is the route I would take for 6-12 months and test it.
What I find surprising is the people think that avoiding what is successful is the way to go, I have never heard this before and would be interested to hear what the alternatives to what works are.... for instance doing what doesn't work, is that the road to success ? I don't know perhaps I am missing something her.