A sense of scarcity: Why it seems like all the good ones are taken
The connection between scarcity and value is something we all know; for example, gold is considered precious because it is rare, not because it makes for a poor construction material. The psychologists’ research suggests that this link has become deep-wired into our neurons, so that even its inverse is unconsciously called upon for life decisions—what’s valuable must be scarce.
To test their value heuristic theory, the researchers had a group of young people view nearly one hundred pictures, half of birds and half of flowers, in random order. They then told participants that they would get paid a few cents either for each bird picture or for each flower picture they had seen. To determine whether a participant would be paid for bird or for flower pictures, the researchers let each participant flip a coin. Before being paid accordingly, all participants were asked to estimate the total number of bird pictures and the total number of flower pictures they had seen.
So in effect, their experimentally-induced yearning caused them to wrongly perceive scarcity.
To increase the validity of their findings, the scientists ran several other experiments. In one, participants of both sexes viewed portraits of men and women, some attractive and some not.
When questioned later, both men and women believed that there were fewer attractive people of the opposite sex than there were of the same sex.
If the portraits were unattractive, they tended not to perceive a sense of scarcity. As in the first experiment, the participants appeared to be substituting their emotional desire for calculation, and ended up believing that what they wanted was less likely to be found.
The results, therefore, suggest that people rely on some deeply ingrained judgmental heuristics when estimating frequencies and probabilities in everyday life, heuristics that can sometimes go astray, for example, when implying a more solitary life than might be warranted by reality.
Source: Association for Psychological Science

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"sigh, why are all the best ones taken"
This is because it saves time and effort in weighing up a suitable mate. If there are other women who find him attractive then he must be suitable. This has been demonstrated in goby fish, where a previously unattractive male suddenly becomes attractive when scientists make imitation female gobies look interested in that male.