It saddens me that the default response is ban, increasingly so for services that need account, but even just reading a webpage can become tedious or impossible :(
Please, do not ruin this option, because even though you may not use it today, you may need it in the future.
Note: I also use tor for low volume crawling. When high volume is needed, it is more favorable to subscribe for domestic VPN proxies, so you may be blocking tor, but you won't block those ranges, and the robots will get their content anyway.