Yes, it certainly is worth paying a hefty fee of 30k for GMAT coaching at Crack ISB Hyderabad. The quality of trainers and the certainty of admission is what draw the candidates here. While there are many institutes that specialize in training for the CAT, very few institutes offer training for GMAT. 

Crack ISB Hyderabad has many features that have made it so popular and demanding among GMAT aspirants

• The peer group is a productive and effective group discussion is possible
• The institute gives the admission essay reviews free of cost while most institutes charge around 20-25k
• The quality of editing is much better at this Institute mainly because the faculty comprises alumni of top B Schools 

So it’s better to pay more for quality education than pay less or the same for substandard education. But remember an Institute can just prepare you for your entrance exam. It’s upon you to put in maximum effort and achieve your goals.