Totally agree with you in saying there should be no 'own' concept.
But as long as car manufactures have support of the government, charging 'own' will continue. Our automotive industry needs a regulatory body that governs over them and sets rules and isn't corrupt.. People will never stop paying own due to the convenience it will provide. The goal should be to stop the dealers/investors from charging the own.. this way you cut the problem from the roots.
I personally chose to pay the premium because if i waited till July 1st and the rates go up 1%, i end up paying 12500-13000 extra.. so paying the 6000 now saves me time and money. In your case.. 52000 is just ridiculous.. even if you wait to book, you'll save a whole lot more b/c a 1 percent increase would be a mere 6500-7000 rupees..