I see what you are saying on the first part, the 49% thing is happening to me as well. But for the second, the mathematical probability is not 50 cards = 1 catch. Many people make the mistake of adding the percentages, wherein these cases that is not how it works. It is a combination binomial of some degree. So you have a 2% chance to catch the epic, you miss, it is still 2%. It does not change to 4% just because you missed the first time.
Using exponential mathematical probability, the miss rate, .98 will go to the 'n'th power ('n' being however many seals you throw at it. So let's say you throw 50 seals at an epic. Normally, it would be assumed 50*(.2)=1=100%; therefore, after 50 shots you should have one. However, take .98^50 and you get .3641 or 36.41%, meaning you would have a 36.41% of missing all of them, or a 63.59% chance of catching it ONCE. That gives you a rough 2/3 chance of catching it as oppose to a guaranteed catch after 50 cards. You would think that after maybe 100 seal cards you would have a guaranteed catch right? Still no. Take .98^100, which would equal .1326 or 13.26%, meaning yet again, you still only have a 86.64% chance of catching it ONCE, and therefore by squaring it, a 75.06% chance of catching TWO.
So what is the "guaranteed" number of cards?
Using logs (the mathematical kind)
(QUICK EXPLANATION: log of x to log base y = n translates to exponents as y^n = x.), so for this example, y is the percentage chance to miss = .98. N is the number of tries, in this case, cards thrown. X is the final product of miss chances. I have set X to .0001 in this scenario to give a .9999 or 99.99% success rate. So log of .0001 to log base .98, once entered into the calculator is equivalent to 455.90, which rounds to approximately 456. This is the N variable. Remember, N is equal to the # of seal cards. So it takes
456 seal cards to pretty much guarantee
ONE epic catch.
ONE. So what is considered
'lucky' and what is
'unlucky'?
Using the same method, with X set to .5, giving a 50% chance of catching the monster ONCE. The given value is 34.30, so approximately 34 seal cards. This is when the chance reaches exactly 50%. If you catch an epic in 34 seal cards or less, consider yourself extremely lucky. Now, setting X to .25, giving a 75% success rate for ONE catch, the result is 68.62, roughly double earlier's, or 69. If it takes you more than 69 seal cards to catch the monster, you can start feeling unlucky, but should not be shocked. Remember as well, the number is only decreasing at a .98 rate, so the chance is not raised as high as you would expect with the following cards after 75.
I hope this made everything more clear, if desired, I will post this in the General Discussion section for everyone to see.
Here is the link for the logarithmic calculator in case you want to try some rates on your own:
http://www.rapidtables.com/calc/math/Log_Calculator.htmRegards,
-Shadehawk