You have to find a delicate balance. You should only get a tattoo if it's meaningful and you think you won't feel like a retard explaining it to your future grandkids when they point and say "what the fuck is that?" At the same time if you sit around thinking too much about some meaningful shit, you'll think too hard about it and thats just as bad. By now you should know enough about yourself to know what genuinely means something to you.
Basically, yes, it's gonna be on you for a while. But at the same time, times are changing. I got a couple shitty tats that people did with homemade guns and one that somebody did with a thumbtack (the tack one actually came out much better than the gun one) and I plan to get them all covered over with professional shit. Its not like laser removal surgery is the only option now, and you know when we're 80 they're gonna fuck around and put a 24 hour tattoo removal/discount cigarette/drive-thru liquor store on damn near every block. As long as you dont wake up from a drinking binge with a swastica tatted on your forehead, you should be alright.
At the same time personally I wouldn't get the ICP tat. Obviously if it means that much to you you should just say FUCK HOMELESS J'S OPINION and get it anyway but hear me out. Even if I was the biggest juggalo in the world right now, I would not get an ICP tat, but I would get a madman face. Why? Because, to an extent, the madman symbolizes something that I have spent years personally contributing to. In my mind, the madman symbolizes and stands for me just as much as it does for Mars. I believe he would back that statement. I've spent six years of my life being personally and closely involved in what the madman stands for, and making people notice it. I've moved away and been homeless just so I could be the head of the MIR street team. So obviously the shit will always mean something to me, regardless if Mars stops making music tomorrow, because in my mind, I helped build it with my own hands. If you honestly feel that way about one of the joker's cards, then by all means go get that shit inked. But just remember that something of someone else's creation can mean the world to you today and not mean shit to you tomorrow. You'll always have a special place in your heart for something you helped make yourself.