I appreciate your question bwayphreak234, as I often wondered the same thing when I lived in DC. I usually go 2-3 times a month, depending on my work schedule, my partner's work schedule etc. I actually love seeing shows by myself, so I don't end up wondering if my friend or guest is enjoying himself/herself. I thought when I lived in DC that I'd be at the TKTS booth every week, but once I got settled in to NYC it turned out not to be as often. If I was single and didn't have 2 dogs that I'm crazy about, I probably would see a lot more shows.
I am lucky to work for a non-profit organization and get to be a member of TDF. This allows me to see a lot more, as $45 dollars per show is a lot more reasonable then even $85.00 when you are living in midtown, paying midtown NYC rent etc. For some shows, my TDF membership allows me to see something many more times than I would have otherwise. Once I fall in love with something, I love sharing it with my friends. It's a lot easier to treat people to a show when the tickets are $45. I ended up seeing Next to Normal 17 times. I was obviously quite moved by the show. On the flip side, there are some shows that I would love to see but don't get to because of having to pay full price.
The only show that I actually watched "evolve" through its previews was Cry-Baby. I think I was the only one...since most people hated it. It is interesting though because some shows that I was just lukewarm to after 1 viewing, I ended up loving and seeing 5-6 times...like JCS, Cry-Baby, and Bonnie and Clyde. The problem is that most audiences only go once, so if it takes 2 viewings to really like something, the show probably has problems. Other shows I see once, and I have no desire to see again...like Ghost, Shrek, End of the Rainbow, and Anything Goes.
Hope this is helpful. See you at the TKTS Booth someday!
"The price of love is loss, but still we pay; We love anyway."