The LPC agreement is more like a "Put" agreement whereby LPC must purchase the shares per the formula up to agreed amounts. The formula mitigates the risk to LPC and is common in equity financing agreements. The terms of the price calculation are fair.
The Cantor agreement had no obligation of Cantor to buy, but simply for Cantor to act as an intermediary or placement agent for a 3% fee with discretion for Cantor to not act, but to instead act on good faith based on market conditions.