That is a very good point. At first I thought how good an idea it was for your area, but the area of action should be wider, I fully agree. However, if you wanted to be competitive you coldn't possibly remove cacti with your hands only, a good machine would be necessary. Still it sounds like a prety plausible business. Good idea, really. Not all good ideas work out, but if this one doesn't work out you will probably have another good idea. I really appreciate the creative mind, cheers mate!