I have a small booklet about roadside motorcycle repairs available on Lulu. Specifically aimed at Old British Motorcycles
A few years back, during one 24 hour period I sold over twenty copies. It seemed every time I looked at the screen there was the notification of another sale. That really felt like 'flying off the shelves', especially for a small niche market But at the end of that time sales stopped almost dead. I still sell the odd copy now and then.
The secret of that brief flurry was publicity. I talked an on-line Brit Bike magazine into giving me some publicity in return for being allowed to use a few selected excerpts as an article. Free for them, free for me.
Publicity sells.
Gyppo