A lot of times people get the wrong idea about a bird because of its size. Each species of parrot has individual and unique traits. Some people think that a cockatoo is higher maintenance than a lorikeet or parrotlet. This is actually very untrue. Many bird owners will tell you that their smaller birds are usually the ones that are the most unpredictable or needy.
Parrotlets especially are known to have very big bird personalities. Many people have a very hard time keeping these tiny parrots in good spirits. JP the parrotlet (pictured), who turns 11 years old at the end of june, is very well known for not getting lost in his flock of amazons. They can be incredibly sweet birds, and you'll be hard pressed to find another bird that is as cage active as a parrotlet.
This species is exceptionally tough to breed in captivity as well. They are known to kill their mates if they're so much as within eye shot of another bird. This mentality also makes it difficult to house multiple parrotlets in a single cage.
The dietary needs of a parrotlet is a far cry from many birds. You have to take into consideration the slight differences in every birds diet. Some parrots need higher levels of proteins, some even need nectar, and some can have severe reactions to an improper diet for their species.
Birds are not ornaments, and shouldn't be purchased to look at. Never think that smaller means easier to care for. Usually it turns out that they pack all the features of their jumbo sized counter parts in a much tighter and smaller package.