Surely if you purchase a domain (domain1.com) and redirect it to your existing domain (domain2.com) you expect to loose all ranking for domain1.com. If 301's are used then the objective is simply to pass on authority, not dominate the search results with 2 domains. If you want to keep domain2.com in the index then you would take Rebecca's option 2 or 3.
Of course, this does not happen equally across the board. Some site owners are lazy and barely put in any effort. As you can probably tell, the four situations I outlined above probably will not occur for website owners who are lazy. Now, for website owners who put in the work and the time for their online properties, you can bet that they would get to benefit from the four situations outlined above.
That’s awesome. For someone that’s willing to “dial for dollars”, I bet there would be a percentage that would convert. It’s a funnel, and the more you put in the top, the more you’ll get out the bottom. 66% success rate sounds high, but I have no data…one would have to try it and see. If anyone is interested, I’d love to interview you after you’ve made the calls and gathered the data!
The second option requires a bit more time and effort than a 301 redirect. You could do a mini overhaul of the site and turn it into a microsite for your main domain. This option is good for exact-match domains for your targeted keyword, and there are other reasons for going the microsite route that Rand's highlighted in his post about root domains, subdomains, subfolders and microsites. This strategy also works better if the old domain has decent rankings for the keywords you're targeting.
The following TLDs are now fully supported with a deleted list and a droplist (pending delete list). .hn, .ht, .rw, .cr, .gl, .gy, .gs, .om, .qa, .ir, .pe, .com.pe, .tc, .ky, .th, .co.th, .ke, .co.ke, .uz, .kz, .pm, .re, .tf, .wf, .yt, .sx, .gd, .gi, .kg, .mu, .im, .ug, .sb, .tl, .st, .sm, .so, .sn, .pf, .nyc, .cloud, link, .ms, .mk, .af, .bi, .pr, .com.pr, .nf, .nc, .dm, .bo, .ki, .iq, .bj, .am, .as, .ax, .fo, .mg