My other business is selling socks on the market. The prices i charge are the same or lower than when i started twenty years ago.There tend to be price points, my favourite being £5, other people like £2.99. So for example i sell a pack of twelve sport socks for £5 and people are happier with this than if it was £4.50. I tend to use price points in window cleaning too, such as £10.
The prices we buy the stuff in at have gone down, although this has begun to change in the last year or so.There is no business manual that tells you to put your prices up beyond what the market will bear.
There are three variables, price, volume and value. (possibly compactness has a bearing too).Expansion is the key, either buy better kit (ftp has invested in gutters), or get help.Everything else is a dead end.