Instead of parsing data on things on shelves with video for the data points why not just use receipts? That correlates more closely to the price data than the c

Instead of parsing data on things on shelves with video for the data points why not just use receipts? That correlates more closely to the price data than the consistency of what's actually on the shelves, though video of the shelves would also be useful (i.e. estimating inventory/shortage).