several previous visas...problem?

Hi, i am currently applying for a business M type through an agency. I have had several business M types before, also a 12 month work Z type (I previously worked in Shanghai) and an S1 Special type (due to a personal matter with my girlfriend at the time). I need to get another business M type, but I was told someone that now due to new laws the government are not granting business M types very easily if you have had them several times before (which I dont understand because other people like myself must regularly travel to PRC on business). Is this true?