I don't think any more acts will be added b/c they've already sold out. It may not be all about the $ to us, but it is to the festival. More bands=less profit=no additions
Think what you want but they ALWAYS add acts in March/April. This year will be no different. Especially look for Sahara additions. The electronic line-up doesn't shake a stick to recent years so I know they will add 2/3 names there.