In that case, you can only subtract 2 tix from the selling bot, and later, if you want to use just a fraction of those two tix, let's say 1.5 in another chain like Goatbots, the bot will keep 0.5 as credit that you cant subtract unless you use it to get new cards
One of the best delirium cards in the game, WotC seems totally okay with this pie-breaker and reprinted it as part of the Outlaws of Thunder Junction Commander precons
Ramp can appear in different shapes and forms: Land-Based Ramp (Cultivate, Rampant Growth) Mana Dorks (Llanowar Elves, Bugenhagen, Wise Elder) Mana Rocks (Mind Stone, Basalt Monolith) Treasure-Makers and other artifact token producers (Smothering Tithe, Sarinth Greatwurm) Extra land drops (Exploration, Exploration Broodship) Land Recursion (Crucible of Worlds, Aftermath Analyst) Rituals (Dark Ritual, Mana Geyser) Cost Reduction (Honest Rutstein, Stormcatch Mentor) Eldrazi Spawn & Scion producers (Eldrazi Skyspawner, Kozilek's Predator) Mana Doublers (Mirari's Wake, Groundchuck & Dirtbag) Temporary mana abilities (firebending) This ranking will cover many of these forms of ramp, but will leave some more specific ones like Treasure-makers to their own separate list
As for your Collector boosters and Boxes
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Playing it on turn three sounds good, but if they just play off-curve for a turn and apply pressure, you spent three mana to do very little