1) My reasons all start with the historical facts: MLPs have been excellent investments. I like to use Alerian MLP index with reinvestment (^AMZX) to track MLP returns. The AMZX is a typical "pure" market cap weighted index of the 50 largest energy-related MLPs. Here are the AMZX total returns, along with the S&P 500 index change for the past 5.5 years. 2011 (YTD) AMZX = +5.5%, S&P500 = +6.82% 2010 AMZX +35.85%, S&P +12.64 2009 AMZX +76.41, S&P +23.49% 2008 AMZX -36.91%, S&P -38.47% 2007 AMZX +12.72%, S&P +3.55% 2006 AMZX +26.07%, S&P +13.6%
My conclusion; Totally ignoring the tax shielding advantages of MLPs, the total return of the MLP sector has been excellent, up years and down, compared to the S&P 500. I very much want to have some of the MLP sector as part of my portfolio.
2) If someone has investments in both IRAs and regular taxable accounts, it makes perfect sense to hold the MLPs in the regular account to take advantage of the tax shield. However like many working people these days, throughout most of my career I have been in a non-pension world. Essentially all of my retirement funds are in 401k's and IRAs. If fact, after paying for my 2 kids college educations, all of my investment funds are in 401ks and IRAs. Therefore, my choice comes down to A) invest in MLPs and give up the tax shield provisions, or B) do not invest in MLPs. Given the returns I presented above, the stability afforded by the strong quarterly cash flow, and my believe that the energy transportation sector is a very solid investment for the foreseeable future, I choose to own MLPs in my IRA.
3) The UBTI issue is very, very easily managed through selection of UBTI-friendly MLPs. I am running the annual UBTI data project on Investor Village, which collects data on real-world investment experience with UBTI. We have over 1000 data points now from over 100 people on over 75 MLPs. While there are MLPs that do generate a lot of UBTI, there are very many that produce very little UBTI for years. It is quite easy to select a diverse portfolio of MLPs that produce little or no UBTI sufficient to invest several hundred thousand dollars in MLPs and stay below the tripwire. If one year an MLP I own jumps up and produces a lot of UBTI, I can use the negative UBTI's from previous years to offset the high UBTI that year, and still avoid paying UBTI tax from within my IRA.
3) not a major issue, but while dealing with K-1s isn't really all that hard, NOT dealing with them is even easier. Other than sending my brokerage a copy of them each year, there is absolutely zero tax reporting effort I have to put into my MLPs by holding them within my IRAs.