SP Question

[andy28]

I understand the concept of SP, yet I'm wondering whether relying on the weight of money might be a more reliable indicator. I've noticed instances where horses go off with an SP that had minimal trading activity around that price, while significantly more trading occurred at either higher or lower prices. If I See the price nearing the off and it either drifts or steams significantly, would it be wiser to back or lay at that point?

For instance, in straight betting scenarios (not trading), let's say a horse is trading around 2.5-2.6, and there's a late surge of money just before the off, causing the price to shift to 2.3. I manage to get on at 2.4, but the SP ends up being 2.36. While I acknowledge that based on the SP I didn't achieve value, it seems I still secured better value compared to most of the lay bettors. In this scenario is SP a factor?