Just as an example of what I mean with the current amount of liquidity:
Let's assume that we opt for bigger vault buys (4% of total vault holding per day) and have a $100M land sale.
On the first day, which is the biggest daily buy the vault would make, it would spend $4M of ETH on ILV.
If we want to limit the price impact to 0.5%, we'd want the vault making buys of about 89 ETH, based on current liquidity. That translates to $183k buys, which means the vault would have to do 22 buys on the first day, or just under one per hour on average (at random times of course).
22 buys could cost as much as $50 each (let's assume it's a bad gas day, at 100 gwei average), which works out to $1100 in ETH spent on gas fees. That's 0.0275% of the total daily buy spent on gas fees. It's basically nothing, and we could easily do more buys with a lower price impact per buy, and still spend what is effectively nothing on gas fees.
It gets to be a problem if we were needing to do hundreds or thousands of daily buys to limit the price impact, and that's kind of the metric we should size available liquidity around.