The other reason is that Russian women are white. Though it is politically incorrect to emphasize the color of skin, the majority of people want to create a family with a person of the same color of skin and you can't blame them for it. The majority of men search for much younger women, who look much more attractive than those whom they usually encounter. Sooner or later they get disappointed. Some men do not limit their search to the local area and start to look for women irrespectively of their place of residence. Many lonely women live in the Western countries, but only a small part of them is interested in marriage. This is why it is very difficult for a man to find diamonds in the dust.
There is still a variety of other reasons for men from the Western countries to seek Russian women marriage. However, the majority of them have never traveled to Russia and for some reason they try to find a Russian wife without ever visiting Russia. Some men go Russia to meet a lot of Russian women at once, but it still does not solve their problem.
But those who look for Russian women anyway cannot always be called ordinary and normal people. Quite a few are jealous proprietors and because of this they haven't found anyone in their country. Others are real women-haters. Women are afraid of such men and feel hostile when they see them. There are also men who heard on TV and read in newspapers that huge numbers of Russian prostitutes have filled the cities of the West. These men stop trying to find a Russian wife, comparing all women of Russia with prostitutes.
Besides, there is sometimes a problem in the West when a man (because of the immaturity) is afraid that his woman could have dated other men before him. Such men look for absolute love, but they hardly ever find it. Sometimes their search continues for many years and even all their lives. They look among school mates, among friends, among clients, among fellow workers, among bosses... Everywhere. And when such men continue their search for a woman in Russia, they are very much afraid that the woman would correspond with another men.
Still, the stream of the western men to Russia does not become any smaller.