This has been discussed in the past. Amounts have been thrown around. Some are for it, others are against it. I just received the following about the South Orkney Islands DX-pedition (AN-008) in an Ohio/Penn DX Special Bulletin: "As with previous PDXG DX-peditions we are again offering a tiered structure for early LoTW upload (from the island) and free QSL cards at the $50 or greater level. Both offers have proven to be very popular with the DX community." The amount mentioned is pretty much what I said it would likely be for this kind of enhanced service. The future is here folks.