Really the only reason a scam site would give you withdraw is to promote more deposits so maybe they will target certain people who can attract more people in. Maybe having a larger public profile gives you a greater edge.
Indeed. IMO, they consistently allow people to withdraw their money for a week or so to build up some trust and then if a "big investor" come in and deposit large sum of money, most likely that is the end of that ponzi.
hyip is the same thing like gambling, even on this forum investor based games (hyips) are in gambling thread, also in hyips the same like in gambling you have a possibility to loose money but you also can make money
Most the time you will lose if you don't know when to stop "investing".