Almost players have leaseing many aircrafts but they bought a few aircrafts, if I will buying all when I have enough some money or continue leaseing ?
When you have "enough money", buying is always better (well nearly always). Depending on the aircraft, what you pay to buy it would only cover the lease for around 6.5 years. So, in a long world, unless you know for sure that you only need the aircraft for a short time, try to buy it.
Of course, the big question is - what constitutes "enough money"? For sure it doesn't just mean that you have the amount of cash that you need for that aircraft - there are money other things to consider. Basically it's a question of 'can the money be better spent elsewhere'? I'll leave it for someone else to explain or, if you search deeper, the question has already been asked many times.