With no fatigue or exp obviously, a way to test tactics and challenge friends from different countries :)

In another game I used to play (RIP Freekick), there were Customised Cups and even Customised Competitions with indeed no fatigue, experience, cards or injuries. It costed some credits to create or play these matches but they were extremely fun. You even could create your own conditions like only U25 players allowed or only teams from the first league or other restrictions. I loved to play these competitions and created a lot of them.
I wouldn't mind to pay credits to do this here too.

Wich site is that(ripfreekick) @rydeck

well, if Whitney Houston was still here, would you call her RIP Whitney Houston?

lol, Torres is right but nevertheless I will answer this one.
The game was called Freekick but earlier this year they decided to pull the plug. This was a bumber for me and it's a pitty you can't try it anymore, you would have loved it.

In Hattrick there are also Tournaments on similar way(no injuries different card system etc), for supporters (analogue of VIP) they're free or for credits. And Ladder matches and there was something more, but that part probably deceased because of lack of interest.