I keep hearing that this game is “pay to win”. If that is the case, then just how much $$$ does one have to pay to finsh top 2 or 3 in every event?
I spend more on this game each month than I do on my rent and car payment put together. ( no, that is not an exaggeration, that is 100% fact, and yes I do have more dollars than sense 
). Yet I usually only hit top 25.
So I am wondering something similar. Just how much does it cost to come out on top everytime, in every event. I could of course just max all my heros, but like the OP said, that’s just too easy. Where’s the challenge? I have every characther so far, and I use them all. I dont just pick 3 or 4 really good ones and use them over and over all the time. I use a combo like high level Patch or Hulk to take the damage and then use that one with two low level 1* characters just because I like to use their power. Or I have one Steve Rogers leveled at over 100 and a second one only at 50. I even enjoy using Daredevil. 
Yes, I said Daredevil. Most people don’t like him because you can’t control where traps go or they get disarmed too easily. And that’s correct. DD is very situational. So the key is to “control the situation”. You know, like if for example there was a character that could move tiles to different places.. places where you want them go so the AI will use them,… I better stop there, I am too close to giving away what should be obvious. Some characters aren’t very good by them selves, but matched with certian others they work splendidly. Like MN Mags and C Storm.
Anyway, back to the topic at hand, spend to win. I spend a lot not just to win, (of course winning is nice), but to enjoy the game better. The more characters I have, the more choices I have. Having high level hero is great, but in low level fights it is just too easy to win sometimes. So having a lower level version of the same character to use for lower level enemies is what I try for. And if that means I have to spend money to have fun, then oh well. I’ve been spending $100 a week on games for over 20 years, I ain’t stopping now.
TL, DR,… I spend money for the entertaint value, ( which is different for everyone), I get from this game, not just to win, which is nice. But winning isn’t everything.
And to those of you that read this and say I am a fool for spending so much, well you may be right. But my cash keeps the game free for others, so you are welcome. 