said by MXB: Too bad I can't buy wholesale.
Wholesale legacy-GAS access at $14.70/month is useless without AHSSPI ($1750/port/month), CBB ($22500/Gbps/month), internet transit and a handful of other tariffed and support components needed to have working internet service, network admins, support staff, etc.
The Bell legacy-GAS port fee is the biggest single item in TSI's (or any other GAS ISP) per-subscriber costs but are far from being the only thing ISPs have to cover with their $25-35/month rates on mainstream plans.
On a subscriber paying $30/month, TSI's margin after Bell costs (what they have left to cover all non-Bell costs and profit) is on average under $7 per subscriber. Offering a 2Mbps plan for $2/month would directly cut into TSI's margin without reducing TSI's costs in any meaningful way.
said by MXB: So the 6 MB is a moneygrab/gouge by teksavvy. Good to know...
Most other GAS ISPs have also given up on offering 640/512 and 2M/800 tiers, likely for the very same reason. Profit margins are already very thin, there is no point making them thinner still by offering an artificially lower priced service that costs practically the same to provide.