Yes. A lot, but it's still extremely cheap and there are literally hundreds of miles of amazing coastline to retire cheaply to, many of which are within 1-4 hours of a major metropolitan city. São Luis (Maranhão), Fortaleza (Ceara), Recife & Olinda (Pernambuco), Salvador (Bahia) and Aracaju (Sergipe) all have amazing and cheap places nearby.
The major cities in the northeast leave a lot to be desired because they are often very poorly run because socialist political parties are in power[0]
A lot of the growth in the Northeast has been due to the Bolsa Família[1] conditional cash transfer program that redistributed wealth to poor across the country, but especially the northeast because many of Brazil's poor live there. It works in a way that doesn't undermine local economics but instead infuses cash at the lowest levels of society, generating economic activity in local communities and providing opportunities for individuals to scale to small businesses and small businesses to scale into larger ones. One of the biggest takeaways for me was that except for major capital expenditures like power plants, ~12 million people spending ~$13 will better allocate ~$156 million dollars than one fund manager investing $156 million dollars. On top of that, a $10 million investment in Brazil is likely to be half of that after graft and palm greasing.
Read up on the Bolsa Familia. IMHO it's really a model of how you institute a social program in a capitalistic way and the northeast is proof.
[0] nothing wrong with many ideas of socialism per se, but if you want socialism within your city/state/country, then you need to ruthlessly pursue capitalism with respect to other cities/states/countries that aren't yours so you can fund your social programs.
[1] http://en.wikipedia.org/wiki/Bolsa_Fam%C3%ADlia