Can airlines in India do a better job of increasing revenues from existing customers?

I recently took a plane ride to Delhi. For this journey I had booked on the low cost carrier Go Air. The flight was pretty uneventful overall. But my attention was drawn to a interesting offer on the flight.

I could as a passenger on the plane, bid for select luxury items displayed by the cabin crew. The items could be purchased if I did become the lowest bidder. The select item would then be handed over to me on payment, which was accepted by cash.

I found this entire exercise very interesting and see a potential for the airline in making more revenue through this route. A snap shot of the items available on the flight for me is below.

Now shopping is a favored past time for most people in India and if leveraged well this could become a very good value add both for the airline and the passengers. Firstly what most airlines have is a retailer's dream. A captive audience of potential customers who have nothing to do for the duration of the flight.

But I feel a value airline would have customers wanting value deals and not necessarily luxury brands. So in that context I have the following suggestions to the airline.

1. Focus on getting good value deals for the customer. They could be discounts on regular sporting and cloth brands rather than having price offs on unknown luxury brands.
2. Invite other manufacturers to launch new products or showcase new designs exclusively for the airline.
3. Look at getting payments through others methods from just accepting cash. Sometimes it becomes difficult for flyer's to pay for all offerings by cash 

In conclusion I feel this is a interesting model and I have not seen many airlines in the world achieve sales through an in flight promotion but at the same time, new models have to be experimented with till they are successful and this is one model that is worth a try.