Previously you also said that you don't experience problems with withdrawals on 99% of the sites you try, why not stay & become a loyal player on 99% of those sites?
Usually someone tries a new site because there are programs such as promotions that are profitable for users, and these programs are vulnerable to cheating, don't you feel like you're taking promotions and using them less wisely?
Yes, there is no point jumping from site to site for gambling. Once you are satisfied with any one or two sites, better stick to them. People are usually greedy and when they see promotions on other new sites, they tend to join there without thinking that there is no guarantee that the money is safe in those new casinos. They may never let you withdraw or may do selective scamming so it is not noticed generally.
Gamblers need to realize that promotions and bonuses are often designed to attract users. Untrusted casinos may exploit promotions and may involve in unethical behavior (like cheating) which can lead to financial losses.