What's the psychology behind buying at round numbers i.e.

>>2782918
It's whatever intrinsic value biased buyers/sellers give these values. 1, 10, 100, 1000 are obvious ones because they are the prime multiples in a metric system. nice, round "flat" values if you will.

150 is a less common one, but retains similar weight because it is still a round multiple of any previous, lower flat values. 2 5s make a 10, 2 50s make a 100.

The rest of the numbers are too "chaotic". 2 153s would be 306, 2 7s would be 14. There is no instantly discernible symmetry of value, no clean, flat numbers. There is only quasi-chaotic randomness.

Obviously the psychology is used against the sentimental traders. Simply sell at 1900 instead of 2000 and you're good.