I think the question was how much do full time webmasters make a month.. and if you're making $300 working full time, well as someboday said, you are far from being a master.
I make about 7-8k a year and never had a free site, or a avs site, or a gallery. Just premium sites making my own content and exchanging links, never worried about SE too much.
Never untill 2-3 days ago did I come to boards like this, and now I am realizing just how many people out there do things complete opposite of me. Starting out with free sites, pumping out as many sites as possible, etc. I am not a master photographer, I have no qaulifications as a web designer other then experience, I am not a real smooth talker with the ladies, I dont know all that much about anything really.. I just have a general knowledge in all areas of adult websites, put them all together and started making money.
As everybody else said, if you work hard, do your thing, dont let other people make your decisions for you, stick to your intuition and keep good advice in mind... You can easily earn atleast 4-5k a month. Best of luck.
Regards,
Sean.