as the others said, the prizes are not limited, but you deserve to know the odds if you plan to spend, they are so low here that they could not even be measured, think of the odds for the lottery, depending on your country/lottery those odds are estimated at 1 in 139,838,160, for events here you would need to add about a dozen more zeroes to the end of that number.

as someone who has had thousands of spins in shinobi wheels and slot machines over the years I can tell you the only prize I have ever gotten have been 3rd slot "lucky" packs from slot machine, and only ever have got myoboku stuff/skill trial stuff from shinobi wheel, 4 years, more money than I care to think about and no "luck" for myself, or for anyone else in my server too

It is your money and if you choose to spend it I wish you best of luck, but I hope you are recharging for another reason, if you are recharging just to try your luck in "random number" events, there's a 99.999999% chance you will be dissapointed