GTLots are used by Global GT only for benchmarking, promotional and marketing purposes.
GTLots can act as a trading performance indicator on the Dashboard allowing the trader to know in a quick and simple way how much overall volume they are trading with their account.
GTLots can also be used as a target or performance metric in promotions, campaigns, and competitions. For example, in a trading promotion, participants might be asked to trade X GTLots to be eligible for/win a prize.
In a similar manner, it can be a trading requirement that needs to be maintained, e.g., monthly trading volume of 5 GTLots, to be eligible for Global GT VIP Services.