Chinese food next to sheraton is very good, but also one of most expensive chinese restaurants I have eaten at. My understanding is they have a two tiered pricing system - lower prices for locals, and the "public" menu prices for white guys...
The Sheraton is unusual in that about 50% of the rooms are permanently reserved for flight crews, and that the crew rates are actually MORE expensive than what the general public pays. The hotel knows it is a captive market. Things may be changing a bit now, but historically all the flight crews stayed there, except Air France which stayed at the Le Meridien in city center. By the early 2000s, the guest room conditions were so bad (same carpets and bedspreads as original construction in 1984), that some of the flight crews were threatening to leave and go into private compounds, that caused the hotel to finally refurbish the rooms. The hotel's own GM referred to the rooms as a "dump" in about 2000.
Bottom line, unless some of those new hotels under construction in Ikeja are now open, and of high quality to provide real competition, I wouldn't expect the Sheraton to offer much of a crew discount for even A380 sized crews!