If you have enough peroanamins, you can make it to 50k as a free player with a lot of luck; you need a high level, a lot of friends (high stamina), and a stockpile of peroanamins. Beat all 100 stages the first day, and the bonus levels will help you get a pile of stamps.
That said, I've actually now (almost) emptied the egacha with the 1-per-day tickets. I refuse to buy anything but the 1-per-days, but with an empty egacha box, it makes getting SECs pretty easy. That's something an almost-free-to-play player can work on over time, and eventually end up with a very decent advantage.