No. I don't think people want desperate shiners. Look respectable, have some decent social skills, be friendly and do an acceptable job and you won't lose customers.
A few years back some Polish guy was sticking leaflets through some of my customers offering to do their houses for £7.00; I was charging - fairly - £20+ for these houses. I lost none.
Then there was 'Mr 50% off guy' who did a massive leaflet campaign (nice leaflet too) offering half price cleans for three cleans, and then a cheap rate after and although I did see this guy working around for about six months, I lost no customers and I haven't seen him around in a year-or-two.
My point is, don't worry; you'll be fine.