Here it is once more --that same 1 Corinthians passage. Notice that it states that spiritual gifts --including speaking in tongues-- have one, and only one, purpose. They are for the common good of the body of Christ --not for the good of the one who has the gift.
Now about spiritual gifts, brothers, I do not want you to be ignorant ... There are different kinds of gifts, but the same Spirit. There are different kinds of service, but the same Lord. There are different kinds of working, but the same God works all of them in all men. (1 Corinthians 12:1, 4-6)
Now to each one the manifestation of the Spirit is given for the common good. To one there is given through the Spirit the message of wisdom, to another the message of knowledge by means of the same Spirit, to another faith by the same Spirit, to another gifts of healing by that one Spirit, to another miraculous powers, to another prophecy, to another distinguishing between spirits, to another speaking in different kinds of tongues, and to still another the interpretation of tongues. (1 Corinthians 12:7-10)
All these are the work of one and the same Spirit, and he gives them to each one, just as he determines. (1 Corinthians 12:11)
Again, spiritual gifts are not just for the good of a particular individual or assembly of believers, but for the good of entire body of Christ. So if you come in contact with a group of believers that focuses its attention on practicing spiritual gifts, you might ask yourself: According to the Bible, are they really using or misusing those gifts?