I think it is more about consistency than anything else. There are tons of casinos that get attention for a while but they usually burn in flames and stop, whatever left is the ashes.
Bitvest is not like that, they never really do "huge" stuff that gets tons of attention all at once, they are not giving away tens of bitcoins all at once and so forth. But, what they do is consistent marketing that always keeps them interesting and getting attention.
So, when there are times some other place gets super amount of attention, bitvest is not really remembered at first, but all of those go away whereas bitvest stays at their own steady pace. This is why I think they get bigger and bigger with time, because they have a steady pace and that means they are going to get people to play here more and more.
Well, being a casino in crypto world is not an easy task. I am not even talking about being a big one that deals with tens of bitcoins every single day and even more in some days. I am just talking about even "existing" because there is costs involved with a casino and if you can't get enough people to wager here, you are not going to exist for a very long time, you can't expect owners to keep paying out of pocket forever, eventually it has to make a profit.
So, that means bitvest is doing something right, they are not only existing, but they are also getting the same attention they always do without dropping it too much in any moment. That is really an important thing we couldn't look over. Plus when you do it for long enough time, you get the hang of it I am sure, like it must get easier with time right?