Prop trading is both the best job in the world and the worst job, depending if your making money or not. The people who are just getting by and paying for costs are probably wasting their time if they have been doing it for a while.
Let's face it, to be a good trader usually takes over one year and firms are completely unrealistic in that they expect traders to get by without a salary for one year (and not to mention lose opportunity income, have no career progression within the industry, learn no transferable skills unless one wishes to become a poker player and get frustrated as hell). Also, firms act all snobbish like its THEM that are doing traders a favour. Firms charge outrageous ridiculous charges for using a desk???? £550 a month for a desk?? and commission on top of roundtrips THEN they take a cut of profits.
Worse of all is that if you're fully backed, you are completely at the mercy of management who may just get bored of you and get rid of you or offer an ultimatum because they want to see that desk space filled up by some sacked ex ib trader with deep pockets. Doesnt matter if you have potential, its just a reality that unless you make money day in and day out, u will not make it in this business. Fair enough but, markets are extremely difficult and its so easy to get stopped out at any given day and then u have to make what u lost two days in a roll to get on the right track.
As for ib traders who want to go prop, they are probably wasting their time as its much better to keep on earning fixed salary and bonus than risk it at a prop firm. Moreover, the traders who dont make it in ib banks are probably pathetic since they trade much bigger size and much more focused desk-wide strategies (not to mention they desk shares all the profits) so they would probably never cut it scalping away without even the help of an analyst!
As for moving from prop to IB bank its possible but requires some clever "manipulation" of the CV and learning of the OTC products of ibs. I have many friends that have made the move.