Actually...yes If you intentionally wired a potentially overloaded circuit. You don't state if your "outlets where you need them and a few others" is more than the circuit can handle. What you do state is that you dont see a need to follow any codes. If you dont follow codes, your insurance company has a green light to void your claim. What makes you think insurance companies are sitting on a mountain of cash to just give away? They look for any reason they can to stay profitable and not payout claims to individuals that choose to be unsafe by their standards. Lets remember, their money, their rules. Whether a legal grow or not, safety first. Homeowners do have inspections, so do tenants.
On a seperate note, Snaps, or anyone else, I've seen outlet adapters for boats, campers, and generators that have a 30 amp plug at one end and a 4x15amp at the other. Do the make an adapter for dryer outlets like that maybe for construction/trade job sites?