Very rarely do I pay full price for a ticket.
I have gotten around fine for the past couple of years seeing shows using rush, lotto, and discounts.
For shows like Wicked, Lion King, and Jersey Boys, where the easiest way to go see them is to buy full price tickets in advance, see those around a time where you might get a lot of money like on a holiday or birthday. I used Christmas money to buy full price tickets to Lion King because I figured, what the heck, I'll probably never be able to see it again.
Most of the other shows I have seen I have gotten discounted through rush, lotto, or discount codes: Drowsy Chaperone, Sweet Charity, Hairspray tour, Wicked tour, Spamalot (which was SRO), Producers, and DRS tour.
You have to know how to look around.
"We like to snark around here. Sometimes we actually talk about theater...but we try not to let that get in our way." - dramamama611