Not all people use EDC for leasing program. Some people use EDC only for trading to buy and sell them on exchanges. EDC has a good liquidity.
Team of EDC Blockchain is constantly developing token economy and create demand in the token. It is very good for the future token price.
Not many tokens are developing so actively like EDC. That is why many people pays a lot of attention to EDC and among such people are speculators too.