@Basuvr You have asked me such a question, where it is difficult to answer. I rarely sell my application in Grey Market. Long back when I had sold Power Grid I got only 3,000 and had to pay about 15,000. Thereafter never sold my luck.
Now regarding your question, how many times you sold your applications and got allotment?
How can you believe in others views 100%. Take today's example of Innovatus Entertainment, subscribed 150x in retail only. In my opinion minimum 10% to 15% applications might have been sold in Grey Market. Is it possible to get most of the applicants to get allotment who sold in Grey Market. But to blame we need proof. Try minimum 20 times, get experience and share if possible.
Only your individual experience can give you your reply.