I think its very worth it. If your guerilla gardening, and say you want 10 plants in the end, istead of ordering 20 seeds and hoping for a 50/50 male to female ratio, you just order 10 feminized. it will cost more on seeds, but in the end you will end up taking care of half the amount of plants. This means spending less on fertilizers and such, spending less time taking care of them, and less of a chance of sombody stumbling upon them. for the extra $50 or so, its definetly worth it.